Sounds like you are using a progressive machine. That might add to the difficulty in finding the real problem by going step by step through the process. Size one of the swollen cases if you decide you want to take a chance on using them and see if they chamber. Then go on to the deprime and flare step, then seat, and then Crimp.
If the full length sized case does not easily chamber, resolve that issue before the next step.
Dusty